Pneumatic riveting-hammer



2 SHEETS-SHEET l e y Patented May 18, 1920.

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J'ohnjiward way J. H. WAY.

PNEUMATIC RIVETING HAMMER. APPLICATION man N,o v. 2 6, 1.918,

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Specification of Letlters Patent.

Patented May 1s, 1920.

Application led November 26,' 1918. Serial No. 264,158.

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Be it known that l, Joris' Hownnn VAY, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new useful improvements in lncumatic Riveting-Hammers, whereof the following is a specification, reference being had to the accompanying drawings.

My invention relates to a pneumatic riveting hammer en'i'ploying` electro-magnetic torce to create resistance to the reaction ot the hammer blow.

ln the accompanying drawings, Figure l,

is side elevation of a pneumatic hanuner, embodying my invention.

. ll, is a sectional view of a part ot lll, is a sectional view along the line` lll, Ill, of Fig. Il.

Figs. IV, and V, are views of the electroa.i ietic plate, respectively from above and ln the ordinary use or" the pneumatic riveting hammer, the operator must oppose his own ..veight or muscular force to the reaction or" the hammer blow, in order to keep the tool centered upon the rivet which is being headed. rhis necessity seriously limitspthe amount ot work which the riveter can accoi plish during a given time, owing to the s .in which it imposes upon his endurance. ltis the object et my invention to relieve the riveter of this strain by employing electromagnetism, as a force by which the riveting hammer is held in placeagainst the surface to be riveted, and at the saine time to so relate the hammer to the electromagnet as to permit the proper amount of swaying of the hammer as it heads the rivet, a motion which i essential to tho proper operation of a riveting hammer.

l lave shown in the drawings one convenient method thus utilizing electromagnetic torce, but it will be understood that my invention is not limited to the par ticular device or scheme which l have illustrater.

The pneumatic riveting hammer l, is shown of standand construction. ein iron plate 2, is located in the region of the working end of the hammer. I have shown l in the form of an annulus, but other s able forms may be employed. Associated with the plate 2, is an electric magnetizing coil 8, so placed that the passage of the current converts the plate into an electro-magnet. The coil may be conveniently held in place by the annular disk 4, secured to the plate 2, by peripheral rings 5, 6,`which overlap the edges of the disk. These are secured to the plate by screws 7, and constitute supplemental magnetic cores. In order that the electro-magnet may rest upon the surface which is being riveted in proper relation to the work, l provide cross grooves S, and 9, cut into the portions which oppose said surface. ln the form of electro-magnet which l have shown in the drawings, these grooves are cut into the peripheral rings 5,

and Tiis enables the hammer with its plate to be so placed upon the work that the slots or recesses bridge over any previously headed line of rivets. The same purpose is also served in part by the space between the peripheral rings 5, and G. The opposing surface of the smaller ring 5, is increased in area by projections l0, l0, as shown.

Attached to the shank ot' the hammer by being seated in a suitable groove 13, is a split collar l2, the halves of which are secured together by rivets 14, passing through connecting lugs l5, formed upon the respective ends of the halves of the split collar. rfhe collar carries a plurality of arms lo, reaching voutwardly in an inclined direction from the collar. i portion of the surface of each arm is provided with a spiral. groove 17. Spiral springs 18, are screwed upon the spiral grooves of the arms. rlhe upper surface of the annular plate 2, is provided with lugs 19, carrying pivoted clevises 20, the extremities of which are also provided with spiral grooves, upon which are screwed the other ends of the springs 18. Thus, said springs constitute the connecting means between the pneumatic hammer and the electronagnetic plate. To stitlien these springs and to enable them to hold the plate at all times in proper relation to the hammer, the

varms l5, are projected within the hollow of the coiled springs so that under norma-l conditions they almost or quite touch the ends the clevises 20. lt will be observed that the springs, as well as the arms, pass from the hammer to the electro-magnet in an inclined direction.

The electric coil of the magnet has its terminal wires litting into a suitable box 25, formed upon or attached to the plate 2, and the cable carrying these wires, is led to a sov suitable switch 26, attached to the body oi' the hammer, and in position to be manipulated by the holder of the tool. F rom said switch is led the cable 27, in which the electric coil is put in circuit with any suitable source of electric current.

In operation the plate 2, is placed upon the steel sheets or other objects to be riveted, in such position that the head of the hammer is in proper relation to the rivet ends which are to be headed. When thus placed, the operator by manipulation of the switch 26, converts said plate into an electromagnet. According to my invention, this electro-magnet is of such configuration, size and carries a suiiiciently strong current, for the electro-magnet to exert force suiiicient to almost or quite hold the plate against the work during the operation of the pneumatic hammer, so that the reaction of each blow of the hammer is taken up largely or altogether by the tensile force of the springs 18, thus relieving the workman from the vnecessity of employing his own strength and weight Jfor this purpose. Furthermore, as the rivet is headed it is possible for the workmen to sway the hammer upon the rivet head as a pivot in the customary manner. This is made possible by the inclination of the springs as they radiate from the ham` mer to the magnet, permitting an accommodation of the springs to the swaying hammer, because the extension of one spring is balanced by a contraction of the opposed spring.

It will be obvious that the magnetized plate may be of different shape from that which I have shown, and may be differently disposed in relation to the hammer. It will also be evident that other means of connecting the hammer to said plate may be employed. I have shown only one form of many for applying my invention.

Having thus described my invention, I claim:

l. The combination with a pneumatic riveting hammer; of a magnetized annular plate disposed in position to attach itseltl magnetically to the surface of the work to be riveted; and a series of spring connections between the hammer and the plate, arranged to radiate from the hammer in an inclined direction, as they pass to the point of their attachment to the plate.

2. The combination with a' pneumatic riveting hammer; of an iron plate and an electro-magnetic coil, disposed in position to rest upon and to be magnetically attached to the surface of the work to be riveted; and coiled springs connecting the hammer and the plate; said springs being arranged on opposite sides of the hammer, and being oppositely inclined to its axis.

3. The combination with a pneumatic riveting hammer; of an iron plate and an electro-magnetic coil, disposed in position to rest upon and to be magnetically attached to the surface of the work to be riveted; connections between the hammer and the plate; and means for regulating' the electric circuit of the coil, consisting of a switch attached to the body of the hammer in position to be manipulated by the holder thereof.

In testimony whereof I have hereunto signed my name, at Philadelphia, Pennsylvania, this 20th day of November, 1918.

JOHN HOWARD WAY.

Witnesses JAMES I-I. BELL,

E. L. FULLERTON. 

